Austenitic
Duplex Steel
Nickel Alloy
Cobalt Alloy

S31803 Pipe/Tube

Parameter Table：

Factory advantages and features：

1.HUXIN PIPE - a seamless pipe supplier invested by MTSCO - is a highly reliable seamless steel tube manufacturer with 35 years of pipe making experience.

2. In addition to regular sizes, Huxin can also produce 18m and 25m extension tubes to provide diversified tube specifications.

3. A full range of production and inspection equipment is available, including cold rolling mills, annealing furnaces, pickling tanks, ultrasonic eddy current integration and physical and chemical laboratories.

4.The complete quality control process covers the factory technicians, while the full-time MTSCO quality inspectors control all the links before, during and after production.

5. We have ISO/PED/AD2000 certificates and other certificates.

Introduction to Quality Control Inspection Methods：

Raw Material Quality Assurance

Stringent warranty and PMI checks are conducted on our raw materials, procured from esteemed steel mills like Baosteel and Tsingshan, ensuring their superior quality. Compliance with material specifications is guaranteed through rigorous PMI checks and other meticulous inspections.

Supervised Production Process

Every phase of our seamless tube manufacturing process, including cold rolling, cold drawing, annealing, pickling, and surface treatment, undergoes meticulous oversight. Skilled engineers, equipped with advanced tools, supervise each step, capturing detailed records through photography. Process cards ensure precision and traceability throughout production.

Quality Assurance Prior to Shipment

Our dedicated QC team conducts comprehensive inspections covering appearance, PMI, size, quantity, and more. Mechanical, hardness, ultrasonic, eddy current, and hydraulic tests are performed. Additionally, we invite third-party evaluations (SGS, TUV, BV) and guarantee secure packaging and container reinforcement to maintain product integrity during transportation.

Packing of S31803 Pipe/Tube：

Material Characteristics and Applications：

S31803 Pipe/Tube is a typical duplex stainless steel pipe, whose metallographic structure is composed of about 50% ferrite and 50% austenite, combining the excellent corrosion resistance of austenitic stainless steel with the high strength characteristics of ferritic stainless steel. The material has excellent resistance to pitting, crevice corrosion and stress corrosion cracking, and is particularly suitable for highly corrosive environments such as chloride ions or seawater. In terms of welding performance, S31803 also performs well, and can maintain duplex balance under controlled processes to ensure stable performance in the weld area. Its yield strength is about twice that of traditional austenitic stainless steel, and it is suitable for occasions with high strength and high corrosion requirements. Common application areas include oil and gas transportation, marine engineering, seawater desalination equipment, chemical equipment, heat exchangers, environmental protection facilities and pulp and paper industry. It is widely used in high temperature, high pressure and harsh working conditions, and is a reliable pipe solution in the industrial field.

Chemical composition：